211131999971647 has 2 divisors, whose sum is σ = 211131999971648. Its totient is φ = 211131999971646.

The previous prime is 211131999971609. The next prime is 211131999971653. The reversal of 211131999971647 is 746179999131112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211131999971647 - 2³⁹ = 210582244157759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211131999971747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565999985823 + 105565999985824.

It is an arithmetic number, because the mean of its divisors is an integer number (105565999985824).

Almost surely, 2^{211131999971647} is an apocalyptic number.

211131999971647 is a deficient number, since it is larger than the sum of its proper divisors (1).

211131999971647 is an equidigital number, since it uses as much as digits as its factorization.

211131999971647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 70.

The spelling of 211131999971647 in words is "two hundred eleven trillion, one hundred thirty-one billion, nine hundred ninety-nine million, nine hundred seventy-one thousand, six hundred forty-seven".